Top-up of your Mutual Fund portfolio simply means that when you have any additional amount available for investment, you may invest this proportionately in your entire portfolio using this feature.
To Top-Up your portfolio, Click on Top Up Portfolio on the MF dashboard or in the Mutual Funds portfolio. All the Schemes in your portfolio will be reflected here with a minimum investment of Rs. 100 in each. You can add or reduce the amount of investment in each scheme. Thus, you can invest in all Schemes in your portfolio with a single tap. Please note that, Top-Up makes a lumpsum investment in all the schemes in which you have invested via Dhan.